26. A crank built up from cylindrical sections by welding required a loading of 250 lb to overcome the resistance when in the posi- tion shown. (a) Compute the maximum normal and shear stresses induced in the section A-A. (b) Determine the maximum shear stresses induced in parts I, II, and III. Ans. (a) (max) 29,000 psi, 7(max) = 15,000 psi (b) 10,550 psi for part I, 6880 psi for II, 15,000 psi for III -7". III II Dia. LA 1" Dia. Fig. 2-38 450 250 lb 1 Dia.